Thank you for your help wvmarle.
wvmarle:
but as you want to measure 1-5°C mostly, a 30k resistor (or a value near it, like 33k) will give better accuracy in that range.
Is this because the resistance of the thermistor will be around the 30k when around 1 to 5 degrees? At 23 degrees the resistance of the thermistor is aroun 9k, so i thought to use a 10k. But if i understand you correct the idea is to use 30k because around those low temperatures that will be around the thermistor?